Test Details: Porphobilinogen (PBG) is an essential component of the heme synthesis pathway. Acute intermittent porphyria is characterized by excretion of porphobilinogen and delta aminolevulinic acid in urine during acute attacks, but not during latency. Random Urinary Porphobilinogen test is the first step in the diagnosis of acute porphyrias such as acute intermittent porphyria (AIP) and other acute attack types of porphyrias associated with neurologic and/or psychiatric symptoms